When operating a Current Sense Amplifier (CSA) with differential input V_sense that is near-zero, we must make sure that the amplifier output stays within linear range. One method to avoid swing limitations is output biasing or level shifting. As a result, zero V_sense is included in the linear input range. Bidirectional CSA provides a convenient option for output biasing. Further, at near-zero V_sense, the offset of the amplifier starts to dominate, resulting in high percentage output error. Offset calibration is effective in improving system accuracy at near-zero V_sense. Some legacy products exhibit large output error at low V_sense levels. This limitation is a tradeoff to accommodate wide input common mode range. Recent development addresses this issue and the low V_sense limitation is eliminated in newly released devices.